$\lim_{x\to0}\left(\frac{\sqrt{x+3}-2}{x^2-1}\right)$
$x^4-3x^3+29x^2$
$\left(-5a-2b\right)^2$
$-4y-2y^2$
$\:\frac{2x^3+3x+22}{x+2}\:\:$
$\frac{1}{2}\left(4-z\right)$
$\left(5y+6\right)\left(5y-6\right)$
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